package com.yzdzy.kotlin.chapter5 import java.lang.StringBuilder fun main(args: Array<String>) { //int range的集合 //阶乘再想加 var res = (0..6).map(::factorial) val res2 = res.filter { it % 2 == 1 } println(res2) } fun factorial(n: Int): Int { if (n == 0) return ...
java.util.stream.LongStream When to Use range() and rangeClosed() methods of IntStream, LongStream for(int i=init; i<=n; i++){//logic goes here} init n to generate a stream of a fixed sequence of numbers starting from an initial until a final value, where each n...
In the last couple of Java 8 tutorials, you have learned how to use map(), flatMap(), and other stream methods to get an understanding of how Java 8 Stream and Lambda expressions make it easy to perform the bulk data operation on Collection classes like List or Set. In this Java 8 ...
Java Copy Code System.out.println("NEO count: " + neoWsData.elementCount); System.out.println("Potentially hazardous asteroids: " + neoWsData.nearEarthObjects.values() .stream().flatMap(Collection::stream) // this converts a Collection of Collections of objects into a single stream .fil...
Modifies the last element of the stream via a defined Function. Example: Flowable .just(1, 2, 3) .compose(Transformers.mapLast(x -> x + 1)) .forEach(System.out::println); produces 1 2 4 match, matchWith Finds out-of-order matches in two streams. javadoc You can use FlowableTra...
[K in keyof O]: O[K] extends Expression<infer V> ? V : never }> > { return sql`json_object(${sql.join( Object.keys(obj).flatMap((k) => [sql.lit(k), obj[k]]), )})` } function getSqliteJsonObjectArgs( node: SelectQueryNode, table: string, ): Expression<unknown>[] { ...
Even though I have used an object of the concurrent hash map here, it's not required because unlikekeySet(), thenewKeySet()is a static method. Let's the code to actually generate a concurrent hash set in Java 8: importjava.util.Set;importjava.util.concurrent.ConcurrentHashMap;/* ...
完整报错如下: 'call(Tuple2<Long, Row>)' in 'Anonymous class derived from org.apache.spark.api.java.function.PairFlatMapFunction' clashes with 'call(T)' in 'org.apache.spark.api.java.function.PairFlatM...error: must use ‘class’ tag to refer to type ‘XXX’ in this scope 开发环境...
Address already in use: JVM_Bind 使用idea时突然间启动项目报Address already in use: JVM_Bind:69775,将本地java进程全部杀死后还是不行。 使用命令:netstat -anob|findstr "59775" 查看该端口进程,如果存在,将其杀死(而我的不存在) 使用命令:netstat -ano 也没有找到该端口......
.getNews() .map { it.newsItem } .flatMap({ items->Realm.getDefaultInstance().executeTransaction({ realm->realm.delete(NewsItem::class.java) realm.insert(items) })Observable.just(items) }) .onErrorResumeNext { throwable->valrealm=Realm.getDefaultInstance()valitems=realm.where(NewsItem::class...